JLG 800A_AJ Service Manual User Manual

Page 379

SECTION 6 - JLG CONTROL SYSTEM (S/N 0300065534 TO PRESENT)

3120858

– JLG Lift –

6-47

2/2

Flash code 2/2 indicates problems with drive & steer selection. Except where noted, these faults are not reported during
2 second power-up sequence.

DRIVE LOCKED – JOYSTICK
MOVED BEFORE FOOTSWITCH

Drive was selected before and during footswitch closure. Can be reported during
power-up sequence.

FSW INTERLOCK TRIPPED

Footswitch was closed for seven seconds with no function selected. Can be reported
during power-up sequence.

STEER LOCKED – SELECTED
BEFORE FOOTSWITCH

Steer was selected before and during footswitch closure.

STEER SWITCHES FAULTY

Both steer switches are active together.

DRIVE / STEER WITH NO QPROX

This fault only occurs with inductive joysticks. It occurs if the joystick is moved out of the
neutral position with no Qprox sensors active.

D/S JOY. QPROX BAD

These faults only occur with inductive joysticks. They indicate that the Q-Prox sensor is
reading above 3.18 volts.

D/S JOY. OUT OF RANGE LOW

Resistive joysticks: These faults do not occur.
Inductive joysticks: The trigger points for these faults are dependent on the centertap
voltage reading. These faults will be triggered when the voltage is less than the centertap
voltage minus half the center tap voltage minus 0.3 volts. If the centertap is at the high
end of the range, these faults will be triggered below 1.05 volts. If the centertap is at the
low end of the range, these faults will be triggered below 0.79 volts.

D/S JOY. OUT OF RANGE HIGH

Resistive joysticks: These faults do not occur if the Vref voltage is below 8.1 volts. If Vref
is above 7.7 volts, Vref is operating out of tolerance or a short to battery has occurred.
Inductive joysticks: The trigger points for these faults are dependent on the centertap
voltage reading. These faults will be triggered when the voltage is more than the center-
tap voltage plus half the centertap voltage plus 0.3 volts. If the centertap is at the high
end of the range, these faults will be triggered above 4.35 volts. If the centertap is at the
low end of the range, these faults will be triggered above 3.8 volts.

D/S JOY. CENTER TAP BAD

Resistive joysticks: These faults occur when the center tap voltage is not between 3.08
volts and 3.83 volts. Due to resistor tolerances there is a +/-.1 volt range around these
values where the fault may be indicated.
Inductive joysticks: These faults occur when the center tap voltage is not between 2.18
volts and 2.70 volts. Due to resistor tolerances there is a +/-.1 volt range around these
values where the fault may be indicated.

WAITING FOR FSW TO BE OPEN

Footswitch was closed when platform mode was selected. Can be reported during
power-up sequence.

Table 6-8. Help Fault Codes, Displayed Faults, and Descriptions - S/N 0300066931 to Present

Fault Flash

Code

Communicated (Displayed on

Analyzer) Fault

Description

Priority